Question 1043650
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The area of a circle can be found by multiplying the number pi by the square of the radius. 
If the radius of a circle is r, write an expression that presents the area of the circle.
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<pre>
The area of a circle 

S = {{{pi*R^2}}},

where R is the radius of the circle.
</pre>

See the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Surface-area/Area-of-a-circle.lesson>Area of a circle</A> 

in this site.


Also, you have free of charge online textbook in Geometry 

&nbsp;&nbsp;&nbsp;&nbsp;<A HREF=https://www.algebra.com/algebra/homework/Triangles/GEOMETRY-your-online-textbook.lesson>GEOMETRY - YOUR ONLINE TEXTBOOK</A> 

in this site.